powersoft_k2_k3_service_info.pdf

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K2 – K3 Series
Version 1.4
July 2013
powersoft_k2k3_service_man_v1.4.docx
© 2013 Powersoft
Index
1.
2.
3.
4.
5.
6.
7.
8.
9.
Opening the amplifier cover
Discharging the amp capacitors
Removing the power supply board
Removing the amplifier output board
Removing the fan
Removing the display
Instruments and tools for testing
Firmware update procedure
Removing the control board (k-cntrl)
3
3–4
4–8
9 –12
12
13 –14
14
14 –15
15
15 –16
17 –18
19 –25
10. Error codes
11. Mechanical parts
12. K2-K3 spare parts list
2
K2 – K3 Service Manual
1. OPENING THE AMPLIFIER COVER
Disconnect the amplifier from the mains. If the amplifier
has been connected to the mains in the last few minutes,
please proceed with attention as the internal capacitors
bank could be charged and harmful!
Remove the side support steel bars, unscrewing the four
bigger screws with a Phillips PH1 screwdriver. Then
remove the screw in the center using a smaller Phillips
PH 0.
Smaller screw, screwdriver Phillips PH 0
Rail LEDs should be off; if not, discharge capacitor banks
Bigger screws, screwdriver Phillips PH 1
Remove the amplifier cover unscrewing the eight screws
(four in the front, two in the centre and three in the
rear) using a screwdriver Phillips PH 0:
If the LEDs are still on discharge the capacitors bank by
connecting a lamp of at least 40 W/230V
Lamp (min.40W/230V, best 60W/230V): dummy load for discharging the
amplifier’s capacitors bank
to the connectors seen in the two pictures below
Eight screws, screwdriver Phillips PH0
2. DISCHARGING THE AMP CAPACITORS
Before proceeding in operating inside the amplifier it is
necessary to check if the rails are completely discharged:
LEDs in picture below should be off, this should happen
about 15 minutes after the amplifier has been switched
off and disconnected from the mains.
Position of connectors for discharging capacitors bank
3
K2 – K3 Service Manual
Fastons between power supply board, output amplifier board and fan
power cables to be disconnected
Following this, unscrew the fans power cables close to
the previous faston.
Negative to this connector
Positive to this connector at first and then to this other one
Detail of connectors
Once the amplifier is open and its power supply fully
discharged, it is possible to start removing the single
boards.
Disconnected fastons between power supply board, output amplifier
board and fan power cables
Disconnect and remove the flat cable bridge between
the power supply board and output amplifier board:
Opened amp
3. REMOVING THE POWER SUPPLY BOARD
Disconnect the faston between the power supply board
and the output amplifier board :
Flat cable to be removed
4
K2 – K3 Service Manual
Removed flat cable
Disconnect the amplifier power switch cable removing
the faston behind it:
Overview of the 7 screws (1-7) and of the brass stand-off (8)
to unscrew for removing the power supply board
Amplifier power switch cable to be removed
Detail of screws number 1-2
Faston of the amplifier power switch cable removed
It is now possible to remove the power supply board by
unscrewing it from the amplifier chassis, removing with
a Phillips PH 1 screwdriver the 7 screws plus the brass
stand-off as illustrated below:
Detail of screws 3 and 4
5
K2 – K3 Service Manual

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